body {
    font-size: .28rem !important;
    background: #fff;
}
/* 頂部導航 */
.nav{
    width: 100%;
    height: 1.48rem;
    background: rgb(41,204,177);
    color: #fff;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: fixed;
    left: 0;
    top: 0;
    z-index: 999;
    font-size: .32rem;
}
.nav i:nth-of-type(1){
    margin-left: .2rem;
    font-size: .34rem;
}
.nav i:nth-of-type(2){
    margin-right: .2rem;
    font-size: .34rem;
}
/* 倒计时 */
.count_down{
    width: 100%;
    height: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 1.48rem;
    font-size: .36rem;
    /* 背景色 */
    background: rgb(245,250,250);
}
/* 钟表标识符 */
.count_down i{
    font-size: .4rem;
    /* 相对定位 */
    position: relative;
    top: .02rem;
    margin-right: .06rem;
}
/* 具体剩余时间 */
.count_down span{
    color: rgb(253, 202, 34);
}


/* 具体测试内容 */
.content{
    width: 7.1rem;
    margin: auto;
    /* border: 1px solid; */
    min-height: 4rem;
}
/* 上-标题部分 */
.content>div:nth-of-type(1){
    margin: .32rem 0;
}
.content>div:nth-of-type(1)>span:nth-of-type(1){
    padding: .06rem .12rem;
    background: rgb(41,204,177);
    color: #fff;
    border-radius: .06rem;
    margin-right: .12rem;
}
.content>div:nth-of-type(1)>span:nth-of-type(2){
    color: #666;
}
.content>div:nth-of-type(1)>span u{
    text-decoration: none;
    color: rgb(41,204,177);
    font-size: .34rem;
}
.content>div:nth-of-type(1)>span:nth-of-type(2){
    letter-spacing: .02rem;
}
/* 问题内容 */
.content>p{
    line-height: 1.5;
    font-weight: bold;
    margin-bottom: .36rem;
}
/* 单选区 */
.radio_box li{
    height: .6rem;
    /* background-color: lightblue; */
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.radio_box li span:nth-of-type(1){
    width: .4rem;
    height: .4rem;
    display: inline-block;
    background: rgba(41,204,177,.2);
    color: rgb(41,204,177);
    border-radius: .06rem;
    margin-right: .06rem;
    text-align: center;
    line-height: .4rem;
}
.radio_box li span:nth-of-type(2){
    color: #999;
}
/* 单选按钮 */
input[type="radio"]{
    display: none;
}
input[type="radio"]+label{
    width: .2rem;
    height: .2rem;
    display: inline-block;
    background: #999;
    border-radius: 50%;
    position: relative;
}
input[type="radio"]+label::after{
    content: "";
    display: block;
    width: .32rem;
    height: .32rem;
    border: 1px solid #999;
    border-radius: 50%;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translateX(-50%) translateY(-50%);
}
/* 激活态 */
input[type="radio"]:checked+label{
    background: rgb(41,204,177);
}
input[type="radio"]:checked+label::after{
    border-color: rgb(41,204,177);
}

/* 底部操作按钮 */
.control_btn{
    position: fixed;
    left: .2rem;
    bottom: .2rem;
    width: 7.1rem;
}
.control_btn button{
    border: none;
    outline: none;
    border-radius: .06rem;
    height: 0.8rem;
    padding: 0;
}
.control_btn div{
    display: flex;
    margin-bottom: .2rem;
    justify-content: space-between;
}
.control_btn div button{
    /* flex-grow: 1; */
    border: 1px solid rgb(41,204,177);
    color: rgb(41,204,177);
    background: #fff;
    width: 45%;
}
.control_btn>button{
    width: 100%;
    background: rgb(41,204,177);
    color: #fff;
}